David tilton



UNITED STATES PATEN OFFICE..

DAVID TILTON, OF STONEHAM, MASSACHUSETTS, ASSIGNOR TO TILTON 8;SWEETSER.

PADLOCK.

Specification of Letters Patent No. 8,318, dated August 26, 1851.

To aZZ whom t may concern Be it known that I, DAVID TiLToN, of Stoneham,in the county of Middlesex and State of Massachusetts, have invented anew and useful Improvement in Locks or Padlocks for Mail-Bags or otherArticles to which the Same May be Applied; and I do hereby declare thatthe same is fully described and represented in the followingspecification and accompanying drawings, letters, figures, andreferences thereof.

Of the said drawings Figure 1, denotes an external or side view of apadlock, constructed on my improved plan. Fig. 9., represents the lockas it appears when its cover plate is removed, and the bolt or haspclosed down or locked. Fig. 3, is the same as Fig. 2, with the exceptionthat the parts are shown in the position in which they appear when thehasp or bolt is raised or unlocked. Fig. 4L, is an underside view of thecover plate, and the projection of the slide thereof. Fig. 5, is a crosssection of the lock, the same being taken through the projection of theslide7 when the latter is at its greatest distance from the key.

In the said drawings A, exhibits the box or case of the lock; B, thecover plate thereof, which is confined in place by screws a, cr, or byany other suitable means.

C, is the bolt, or semi-circular curved hasp, both of whose ends are soadapted to the lock case, as to enter within it as seen in the drawings.The hasp turns on a fulcrum or pin Z), and has a short arm @extendedfrom it, as seen in Figs. 2 and 3, whereby it is converted into a shortlever, having the lower end of the short arm c, made square or nearlyso. This short arm operates in connection with a recess or shoulder CZ,made within the tumbler E, which tumbler may be made as a lever to turnon a pin or fulcrum cZ, or it may be made as a simple slide to move upand down, and be moved in one direction by the key, and in the other oropposite direction by a spring g, suitably applied to it.

The key pin is seen at N, and is placed under the long arm of thetumblerE. In case the tumbler is made to simply slide up and down, the key pinmight be placed on the opposite side of it, or above it if necessary.

To the outer face of the cover plate a slide plate Gr, is applied, insuch manner that it can be slid or moved either toward or away from thekey hole Z0, made through the cover plate, and far enough either toentirely cover or uncover the key hole. A projection or stud Z, is madeto extend from the slide and into the lock. This projection playsthrough a slot m, and is so arranged that when the slide G, is movedback, or entirely off the key hole, it (the projection) rests or isbrought against a shoulder or part n, of the tumbler, and therebyprevents any movement of the tumbler by the key, applied to and workingupon the key pin. Consequently under such a state of things, the hasp orbolt cannet be opened. Zhen however the slide G, is moved up against.the key, and so as to partially cover the key hole, the projection Z, isbrought opposite to or against a recess o, made in the tumbler, and ofsuch shape as will allow of the movement of the tumbler by the keywithout the projection Z, offering any hindrance thereto.

To unlock the bolt or hasp, the key is to be inserted in the key hole.Next the slide G, should be moved up against thekey, or so as to bringthe stud or projection Z, opposite to the recess 0. This done, the keyis next to be turned so as to move the tumbler, and allo-w the hasp orturning contrivance to be raised. Zhen the lock is unlocked, should wedesire to lock it, we must first move the slide G, so as to eitherwholly cover the key hole, or to cover it to the extent it does when itis moved up against the key. This done, the hasp or yturningcontrivance, can be moved into its locking position. So long as theslide does not extend over the key hole as above described, the lock'can neither be locked or unlocked. When the slide is thrown back, thehasp cannot be moved. Therefore under such a position of it, the lockcannot be picked or opened, by the introduction of a key, or any otherinstrument.

To a person unacquainted with the lock, the slide and its projectionwhen moved back, or from over the key hole, oer an obstacle to thepicking of the lock, or opening In testimony Whereoi` I have hereto setit by the key or any other article. my signature this third day of JulyA. D. l0

Vhat I cllaim as myff illivention, is 1851. The com ination o tieturning hasp or oontrivance C, the tumbler E, andthe slide DAVID TILTON'Gr, and its projection Z, or any mechanical IVitnesses:

equivalents, the Whole being made to operate CALEB EDDY,

together, substantially as described. FRANCIS GOULD.

